The Study Of The Gold Sequence Used In WCDMA Spreading Spectrum Communication System

Along with the issuance of 3G licenses, China's formally entryed into the 3G era. The key technologies used in 3G are focuses of researching in different coutries, thereinto the choice of spreading code which is one of the essential key technologies. This paper studies the Gold sequence used in WCDMA system's spread spectrum operating as scrambling code, thereinto containing the analysis and discussion of the way to generate and characteristic of related sequences, with focus on the approach to obtain the balanced Gold sequence.In this paper, firstly, it shortly introduces the different choice of the address code in the three standards of the third generation mobile communication system, and makes a simple comparison; Gold sequence is generated by the m sequence pairs based on m sequence, so this paper makes a discussion and research on the generation,correlation and balance performance of m sequence and Gold sequence respectively, and also a comparison; Designs all the pertinent MATLAB programs to get large numbers of pertinent date and figures; and after the analysis and discussion of the sequences's generation and chracteristic using the obtained results, puts forward some kinds of useful conclusions.About the balanced Gold sequence, this paper firstly analyzes and discusses its superiority of performance and gets a large number of pertinent date,figures and useful conclusions; then makes simulate implementation and verifies each of the existing methods and the related statements to obtain the balanced Gold sequence, to point out their own problems and limitations. Therefore, this paper puts forward a new method to obtain the balanced Gold sequence based on validating,analyzing and researching over and over again, to solve the problem of inadequate condition of the original method. And on this basis, it makes the same further improvement on the last one of the original methods to make its qualification more complete. Using MATLAB as the experimental platform, this paper substantiates all the obtained methods and conclusions, and the result indicates the correctness of the new method,improved method and the pertinent conclusion. WCDMA system uses the shortened balanced sequence according to their needs, so this paper simulates and researches the methods to short the balanced Gold sequence and the characteristic of the shortened balanced Gold sequence, puts forward some useful conclusions after obtaining a large number of dates and figures.